S
M
T
W
T
F
S
26
37°
30°
27
35°
29°
28
38°
29°
29
39°
33°
30
41°
28°
1
48°
28°
2
53°
32°
3
40°
33°
4
48°
33°
5
49°
36°
6
48°
37°
7
51°
38°
8
40°
36°
9
46°
36°
10
52°
38°
11
49°
39°
12
41°
37°
13
39°
35°
14
46°
35°
15
49°
39°
16
48°
38°
17
47°
39°
18
43°
37°
19
48°
35°
20
52°
39°
21
48°
35°
22
45°
36°
23
51°
34°
24
54°
41°
25
57°
41°
26
55°
40°
27
52°
41°
28
53°
40°
29
51°
39°
30
52°
40°
31
51°
41°
1
53°
38°
2
52°
40°
3
51°
37°
4
51°
37°
5
52°
42°
6
52°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in St. John Island
St. John Island's May 2026 forecast shows daily high temperatures ranging from 45° to 57°, with overnight lows between 34° and 42°. The average high for May is 52° with an average low of 39°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in St. John Island. See also: June | July | August.
